Reasons Why Brittany Murphy and Casey Johnson Died

The results are in for the cause of Brittany Murphy's and Casey Johnson's deaths. Both girls died earlier this winter but the exact reasons were unknown at the time.

US Magazine reports that Murphy – who was found dead Dec. 20 at the age of 32 – died of pneumonia "exacerbated" by multiple drug intoxication. The actress, who weighed 115lbs at the time of her death, also suffered from iron deficiency and anemia.

As for the heiress Casey Johnson, the coroner has released a statement saying she died of "diabetic ketaocidosis." The 30-year-old socialite was diabetic.